Stanley has made the definitive thermos since 1913 and the classic flask proves it — keeps drinks hot for 24 hours in genuine field conditions, virtually indestructible stainless steel, and a lifetime warranty that Stanley actually honours. The lid doubles as a cup. Seen on every construction site and expedition for a century because it works without compromise.
Hydro Flask's TempShield insulation keeps drinks hot for 12 hours and cold for 24 in genuine outdoor conditions. The wide mouth means it's easy to fill, easy to clean, and accepts ice cubes for cold drinks. Powder coat finish, lifetime warranty, and a range of colours broader than any other thermos brand. The step up from Stanley that most outdoors people eventually make.
Fellow makes the most considered thermal mug available — the Carter uses their ceramic-coated interior that doesn't taint taste the way raw stainless does, a lid that seals completely but opens with one hand, and a silhouette that looks genuinely beautiful on a desk as well as in a pack. Temperature retention is 12 hours hot and the construction is exceptional for the price.